Added README

psgen/README.md

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+# psgen
+## A minimal command-line password generator.
+
+## Usage
+
+./psgen [OPTIONAL PASSWORD LENGTH HERE]
+
+### Examples
+
+```
+./psgen 255
+```
+will output a password with length of 255
+
+```
+./psgen
+```
+will output a password with length of 8
+
+```
+./psgen 10
+```
+will output a password with length of 10